Buggy code:
public class IMAPServer implements Observer , IMAPListener { private static final int STEP_SIZE = 50 ; private static final int UID_FETCH_STEPS = 500 ; private static final Logger LOG = Logger . getLogger ( "org.columba.mail.imap" ) ; private static final Charset UTF8 = Charset . forName ( "UTF-8" ) ; private static final Charset DEFAULT = Charset . forName ( System . getProperty ( "file.encoding" ) ) ; private IMailbox selectedFolder ; private MailboxStatus selectedStatus ; private String delimiter ; private IMAPProtocol protocol ; private ImapItem item ; private MimeTree aktMimeTree ; private Object aktMessageUid ; private MailboxInfo messageFolderInfo ; private boolean firstLogin ; boolean usingSSL ; String [ ] capabilities ; private long lastCommunication ; private IStatusObservable observable ; private int MIN_IDLE = 30 * 1000 ; private boolean updatesEnabled ; private IFirstLoginAction firstLoginAction ; private IUpdateFlagAction updateFlagAction ; private IExistsChangedAction existsChangedAction ; public IMAPServer ( ImapItem item ) { } protected IStatusObservable getObservable ( ) { } protected void printStatusMessage ( String message ) { } public String getDelimiter ( ) throws IOException , CommandCancelledException , IMAPException { } public void logout ( ) throws Exception { } private void openConnection ( ) throws IOException , CommandCancelledException , IMAPException { printStatusMessage ( MailResourceLoader . getString ( "statusbar" , "message" , "connecting" ) ) ; int sslType = item . getIntegerWithDefault ( "ssl_type" , TLS ) ; boolean sslEnabled = item . getBoolean ( "enable_ssl" ) ; if ( sslEnabled && ( sslType == ( IncomingItem . IMAPS_POP3S ) ) ) { try { protocol . openSSLPort ( ) ; usingSSL = true ; } catch ( SSLException e ) { int result = showErrorDialog ( ( ( ( ( ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_handshake_error" ) ) + ":<seq2seq4repair_space>" ) + ( e . getLocalizedMessage ( ) ) ) + "\n" ) + ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_turn_off" ) ) ) ) ; if ( result == 1 ) { throw new CommandCancelledException ( ) ; } item . setBoolean ( "enable_ssl" , false ) ; item . setInteger ( "port" , DEFAULT_PORT ) ; protocol . openPort ( ) ; } } else { protocol . openPort ( ) ; } if ( ( ( ! ( usingSSL ) ) && sslEnabled ) && ( sslType == ( IncomingItem . TLS ) ) ) { <START_BUG> if ( ( isSupported ( "STLS" ) ) || ( ( capabilities . length ) == 0 ) ) { <END_BUG> try { protocol . startTLS ( ) ; usingSSL = true ; IMAPServer . LOG . info ( "Switched<seq2seq4repair_space>to<seq2seq4repair_space>SSL" ) ; } catch ( IOException e ) { int result = showErrorDialog ( ( ( ( ( ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_handshake_error" ) ) + ":<seq2seq4repair_space>" ) + ( e . getLocalizedMessage ( ) ) ) + "\n" ) + ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_turn_off" ) ) ) ) ; if ( result == 1 ) { throw new CommandCancelledException ( ) ; } item . setBoolean ( "enable_ssl" , false ) ; protocol . openPort ( ) ; } catch ( IMAPException e ) { int result = showErrorDialog ( ( ( ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_not_supported" ) ) + "\n" ) + ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_turn_off" ) ) ) ) ; if ( result == 1 ) { throw new CommandCancelledException ( ) ; } item . setBoolean ( "enable_ssl" , false ) ; } } else { int result = showErrorDialog ( ( ( ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_not_supported" ) ) + "\n" ) + ( MailResourceLoader . getString ( "dialog" , "error" , "ssl_turn_off" ) ) ) ) ; if ( result == 1 ) { throw new CommandCancelledException ( ) ; } item . setBoolean ( "enable_ssl" , false ) ; } } } public List checkSupportedAuthenticationMethods ( ) throws IOException { } private String [ ] getCapas ( String command ) throws IOException { } public boolean isSupported ( String command ) throws IOException { } private void fetchCapas ( ) throws IOException { } private int getLoginMethod ( ) throws IOException , CommandCancelledException { } private void login ( ) throws IOException , CommandCancelledException , IMAPException { } public void setFirstLoginAction ( IFirstLoginAction action ) { } public void ensureSelectedState ( IMAPFolder folder ) throws IOException , CommandCancelledException , IMAPException { } public MailboxStatus getStatus ( IMAPFolder folder ) throws IOException , CommandCancelledException , IMAPException { } protected String fetchDelimiter ( ) throws IOException , CommandCancelledException , IMAPException { } public ListInfo [ ] list ( String reference , String pattern ) throws Exception { } public Integer append ( InputStream messageSource , IMAPFlags flags , IMAPFolder folder ) throws Exception { } public Integer append ( InputStream messageSource , IMAPFolder folder ) throws Exception { } public void createMailbox ( String mailboxName , IMAPFolder folder ) throws IOException , CommandCancelledException , IMAPException { } public void deleteFolder ( String path ) throws Exception { } public void renameFolder ( String oldMailboxName , String newMailboxName ) throws IOException , CommandCancelledException , IMAPException { } public void subscribeFolder ( String mailboxName ) throws IOException , CommandCancelledException , IMAPException { } public void unsubscribeFolder ( String mailboxName ) throws IOException , CommandCancelledException , IMAPException { } public void expunge ( IMAPFolder folder ) throws IOException , CommandCancelledException , IMAPException { } public Integer [ ] copy ( IMAPFolder destFolder , Object [ ] uids , IMAPFolder folder ) throws Exception { } public int fetchUid ( SequenceSet set , IMAPFolder folder ) throws IOException , CommandCancelledException , IMAPException { } public Integer [ ] fetchUids ( SequenceSet set , IMAPFolder folder ) throws IOException , CommandCancelledException , IMAPException { } private SequenceSet [ ] divide ( SequenceSet in ) { }

Fix:
if ( ( ( isSupported ( "STLS" ) ) || ( isSupported ( "STARTTLS" ) ) ) || ( ( capabilities . length ) == 0 ) ) {